Really would have to see your setup...but the standard TT type deep keel on a single engine....some have pressed them out, some cut from the inside of the boat...some from the sides of the keel...anything to relieve some of the pressure/friction and get an grip on it to speak.

Repair is done with another tube or coating the inside with 5200 as RickB reportedly suggested...others have used thickened epoxy and multiple coats.